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| // <Snippet1> | |
| using System; | |
| using System.Text.RegularExpressions; | |
| public class Example | |
| { | |
| public static void Main() | |
| { | |
| string pattern = @"(\w+)\s(\1)"; | |
| string input = "He said that that was the the correct answer."; | |
| foreach (Match match in Regex.Matches(input, pattern, RegexOptions.IgnoreCase)) | |
| Console.WriteLine("Duplicate '{0}' found at positions {1} and {2}.", | |
| match.Groups[1].Value, match.Groups[1].Index, match.Groups[2].Index); | |
| } | |
| } | |
| // The example displays the following output: | |
| // Duplicate 'that' found at positions 8 and 13. | |
| // Duplicate 'the' found at positions 22 and 26. | |
| // </Snippet1> |